Thermoregulation and tropical lizards
If darker pigments absorb heat, while lighter colors reflect heat, do people with heavily tanned skin absorb more heat than those who are pale skinned? How could we test this out?
Can some reptiles generate their own body heat?
Some species of pythons can raise their body temperature when incubating their eggs.
Conduct a survey of species colors from both warm climates and cooler climates. Consider butterflies or bird species. Do warmer climate species, as a rule, have darker coloration then species from cooler climates?